Quick-acting hold-down clamp



1953 w. J. SOBASKI QUICK-ACTING HOLD-DOWN CLAMP Filed D60. 18, 1950 Walter J Sobaski IN V EN TOR MW-fim Patented Nov. 10, 1953 UNITED QUICK-ACTING HOLD-DOWN CLAMP Walter J. Sobaski, Chicago, 111:, assignor to Genevieve Sobaski, Chicago, Ill.

Application December 18, 1950, Serial No. 201,308

2 Claims.

This invention relates to new and useful improvements in clamps and the primary object of the present invention is to provide a quick-acting clamp consisting of a base and a frame slidably and pivotally secured to the base and supporting a clamp screw together with novel and improved means for holding the frame against pivotal movement.

Another important object of the present invention is to provide a quick-acting clamp of the aforementioned character including a cross-bar carried by the base and received in a specially shaped slot or notch in the frame to prevent downward sliding and pivotal movement of the frame when the base and frame are disposed in a vertical position with the pivot for the frame horizontal.

A further object of the present invention is to provide a quick-acting clamp including an attaching base having side flanges for entering a T-shaped slot in a supporting structure to detachably secure the clamp to the supporting structure.

Other objects and advantages reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming part hereof, wherein like numerals refer to like parts throughout, and in which:

Figure 1 is a side elevational View of the present invention and showing the frame swing to an inactive position;

Figure 2 is a view similar to Figure 1 but showing the frame in position for use;

Figure 3 is a vertical sectional view of a supporting structure and showing the present invention in front elevation applied thereto;

Figure 4 is an enlarged vertical sectional view taken substantially on the plane of section line 4-4 of Figure 3; and,

Figure 5 is an elevational view of the present invention mounted in a vertical position upon a vertical support.

Referring now to the drawings in detail, wherein for the purpose of illustration, there is disclosed a preferred embodiment of the present invention, the numeral It! represents a channel shaped base whose web portion [2 is provided with side flanges l4 that will enter the offset portions !6 of a T- shaped slot is in a supporting structure 20.

The leg portions of the channel shaped base l0 support a pivot 22 that extends through an L- shaped slot 24 in the inner end portion of a plate-like frame 28. The outer end portion of the frame 28 is permanently attached to an internally threaded sleeve 32 that receivably engages a clamping screw 34 having a clip 36 swiveled to its Work engaging end.

The inner end 26 of the frame 28 is provided with an elongated notch 38 that parallels the slot 24 and which includes a laterally projecting inner end 40 that extends away from the slot 24. The base l0 supports a cross-bar 42 of a width equal to the width of notch 38 but which is less in width than the combined width of the notch 38 and the end 40.

When the device is not being used, the frame 28 is tilted back with the corner 26a of end 26 resting against the web portion l2 and pin 22 is located at the end of slot 24 remote from the offset 24a of the slot, as shown by dotted lines in Figure 4. To use the device, the frame 28 is pivoted clockwise and raised, as shown by Figure 1. Then the frame is pivoted additionally clockwise with the pin 22 at the end of slot 24 having the olfset 24a so that the end 26 clears bar 42. Next, the frame is slid forwardly so that bar 42 will be disposed in notch 40 as is shown in Figure 2 and by full lines in Figure 4. The screw 34 is now disposed in a vertical position and may be adjusted downwardly to clamp work thereunder.

To move the frame and screw to an inoperative position, the screw 34 is first backed up from the work and the frame 28 is pulled toward the user and away from bar 42 until the end 26 clears bar 42. The frame 28 is then pivoted counterclockwise until corner 26a of end 26 rests on web portion l2 or the frame is raised and pivoted until end 26 engages upon the bar 42 (dotted lines in Figure 4).

When the flanges 54 and base H] are received in a T-shaped vertical slot lBa in supporting structure 20a the cross-bar 42 will enter the end 40 of the notch 38 to retain the frame 28 against pivotal and sliding. movement on the pivot 22. The offset end of slot 24 will receive the pin 22 as frame 233 is swung downwardly and to the left from its position shown in Figure 5 to retain the screw 34 at a substantially 45 angle to the vertically disposed web portion [2 of base l0.

Having described the invention, what is claimed as new is:

1. A quick-acting clamp comprising a channel shaped base, a frame having inner and outer end portions, the inner end portion of said frame being received in said channel shaped base and having a slot therein, a pivot carried by said base and extending through said slot, a clamping screw carried by said frame, said inner end portion having a notch therein parallel to the slot and at right angles to the screw, and a cross-bar carried by said base and received in said notch when the frame is in operative position to hold the frame against pivotal movement said notch and said slot being parallel to the base when the crossbar is disposed in said notch.

2. A quick-acting clamp comprising a channel shaped base, a frame having inner and outer end portions, the inner end portion of said frame being received in said channel shaped base and having a slot therein, a pivot carried by said base and extending through said slot, an internally threaded sleeve fixed to said frame, a clamping screw threaded in said sleeve and disposed perpendicular to the slot, said inner end portion having an elongated notch therein paralleling said slot and having a laterally projecting inner end WALTER J. SOBASKI.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,085,816 Lord. Feb. 3, 1914 1,131,869 Schade Mar. 16, 1915 1,886,874 Drain Nov. 8, 1932 2,355,386 McCullough Aug. 8, 1944 

